Chapter 7 - Exponents and Exponential Functions - 7-5 Division Properties of Exponents - Practice and Problem-Solving Exercises - Page 445: 79

$\frac{10}{3}$ $m$

Given , speed of the waves = $3\times10^{8}$ $\frac{m}{s}$ and frequency = $9\times10^{7}$ $\frac{waves}{s}$ Now, wavelength = $\frac{speed}{frequency}$ $=$ $\frac{3\times10^{8} m/s}{9\times10^{7}waves/s}=$ $\frac{10^{8-7}}{3}$ $m$ Hence, wavelength $=$ $\frac{10}{3}$ $m$